The processing technology of coin edge is as follows

The processing technology of multi-choice coin edge is ().

A. discontinuous thread teeth

B. continuous spiral teeth

C. Full-tooth interval half-tooth

D, edge rolling and edge rolling groove

Answer: ABCD

Please click to enter a picture description.

Coins issued by New China can be roughly divided into ordinary coins; Metal commemorative coins for circulation and precious metal commemorative coins for collection? . Among them, precious metal commemorative coins, commonly known as gold and silver coins, are expensive and have a small circulation. Due to political, economic and foreign exchange earning considerations, the state is now focusing on developing the international market in sales, and at the same time, it has begun to cultivate, base itself on the domestic market and promote it on a large scale throughout the country.

Please click to enter a picture description.

The "duty" of coins is to act as a circulation intermediary. But with the needs of collection and investment, some other coins have been derived. Although coins have different classification standards. But it is the most essential and basic method to classify according to the purpose of collection.